Fixed database check.

sports-matcher/server/middleware/database.js

@@ -1,7 +1,7 @@
 import mongoose from "mongoose";
 
 export function needDatabase(req, res, next) {
-    if (checkDatabaseConnection()) {
+    if (!checkDatabaseConnection()) {
         res.status(500).send("Internal server error: Database connection faulty.");
     } else {
         next();